The Life of a Star (From Nebula to Supernova)

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Step 1: The Stellar Nebula

Stars aren't born out of nothing. They begin in a massive cloud of gas and dust called a Nebula. Gravity begins to pull this dust together into a swirling vortex. As the pile of dust grows, it gets hotter and hotter, preparing for a "spark."

Step 2: The Protostar

The cloud has now collapsed into a hot, spinning ball. It isn't a star yet because it hasn't started "Nuclear Fusion." It is gathering mass from the surrounding nebula. If it gets heavy enough, the pressure in the core will cause it to ignite.

Step 3: Main Sequence Star

This is the longest stage of a star's life. The star is now burning hydrogen into helium. This process creates an outward pressure that perfectly balances the inward pull of gravity. Our own Sun is currently in this stable, happy stage!

Step 4: The Red Giant

Eventually, the star runs out of hydrogen. The core shrinks, but the outer layers expand and cool down, turning the star a deep red. It becomes massive—large enough to swallow up nearby planets.

Step 5: Supernova or White Dwarf

Small stars fade away into "White Dwarfs," but massive stars go out with a bang! A Supernova is a massive explosion that sends heavy elements (like the iron in your blood!) across the universe. What remains might become a Black Hole or a Neutron Star.

Step 6: How a Star is Born Video

Once you have finished, see if you can sketch the life cycle of a star.